Stop disabling force_compositing_mode for background RenderViews.

content/public/browser/web_contents_delegate.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/public/browser/web_contents_delegate.h"
 
 #include "base/compiler_specific.h"
 #include "base/logging.h"
 #include "base/memory/singleton.h"
 #include "content/public/browser/render_view_host.h"
@@ skipping 178 matching lines @@
 void WebContentsDelegate::Detach(WebContents* web_contents) {
   DCHECK(attached_contents_.find(web_contents) != attached_contents_.end());
   attached_contents_.erase(web_contents);
 }
 
 gfx::Size WebContentsDelegate::GetSizeForNewRenderView(
     const WebContents* web_contents) const {
   return gfx::Size();
 }
 
+bool WebContentsDelegate::IsNeverVisible(WebContents* web_contents) {
+  return false;
+}
+
 }  // namespace content